(1901 Pan-American Exposition) Buffalo, N.Y., Aug 19, 1901, P.O. Dep't. Ex. Superb full strike of non-postal international machine postmark (Bomar B01-12) on Post Office Department Exhibit souvenir handout card, Extremely Fine and choice, less than 25 examples recorded. Estimate  $150 - 200. $0 (Image)